Type-writing machine.



JIEALLARD.

TYPE WRITING MACHINE.

APPLIQATIGN FILED M11120, 1909. 924,525. v Patented June 8, 1909.

2 SHEETS-SHEET 1.

J' F. ALLARD.

TYPE WRITING MACHINE.

APPLICATION PI-LBD MAR. 20, 1909.

924,525. Patented June 8, 1909.

B BEESTB-SHBBT 2.

Wiines'sesk fnuclzzon UNITE earn r reins.

J FRANK ALLARD, O1" BROOKLYN, NEW YORK, ASSIG-NOR TO UNDERWOOD TYPEWRI'IER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE Specification of Letters Patent.

Patented June 8, 1909.

Application filed March 20, 1909. Serial No. 484,690.

useful Improvements in Type-Writing Ma chines, of which the following is a specification. v

This invention relates to typewriting machines, which are especially constructed to facilitate the writing of bills and simultaneously recording them, in a manner commonly known as condensed charging a mechanism of this kind being illustrated in United States Letters Patent No. 889,855 granted to J. G. McLaughlin, June 2, 1908.

In the operation known as. condensed charging, after the writing of a bill is completed, the platen is turned backwardly a considerable distance, the written bill is Withdrawn, a fresh bill head is inserted, and

then the platen is rotated forwardly to its initial position. Durin these operations the record sheet and car on sheet remain in the machine; and the first line of writing on the new. bill directly follows the last line of writing on the first bill, so that the necessity is avoided of leaving a gap between the entries on the record. sheet to correspond with the depth of the heading on-the printed bill head. This special backward and forward -rotation of the platen isusually effected by a crank, which rotates about the platen axis,

playing between stops provided upon the laten frame. Therotation of this crank is limited to alittle less than an entire revolution; but in practice this is found sufficient for ordinary bill heads.

Where the depth of the printed portion of the bill head exceeds the circumference of the platen, and it is consequently necessary for the platen to turn backwardlymore than an entire revolution at a single stroke, it has been proposed to employ movement-multiplying gearing between the crank and the laten, so that a-strokeof the crank through ess than an entire revolution will turn the platen through more than an entire revolution. i

,. One of the principal objects of the present invention is to provide for the rotation of the platen-driving crank itself' through more than an entire revolution at one stroke, so

that it may. :be connected directly to the platen, thus avoiding the necessity of employing gearing.

In carrying out the invention in one forna, the platen-driving crank is mounted to rotate about the platen axis, and its movements are limited by a stop mechanism possessing novel features. The crank is provided with a dog or pawl to on age a notched wheel which is fixed to the p atcn axle and hence to the platen. A stop is provided for limiting the initial stroke of the crank,

wheel and platen, but the crank is enabled during its first revolution to pass freely by said stop, and is arrested thereby upon a second revolution in'the same stroke; the exact point of arrest being determined by the position to which the stop. is adjusted around the laten axis. Another stop is provided for imiting the return stroke of the driver and platen to initial position, but the crank is enabled during its first return revolution to pass freely by its return stop, which finally arrests the crank'and platen upon return thereof .to initial position. Thus the stroke of the crank about the platen axis is considerably lengthened over prior devices, and the movement of the platen is made correspondingly greater, so as to accrnnmodate/ hills which have extraordinary depths of printed headings.

Provision is made for automatically dis connecting the crank from the platen upon their return to initial positions, to permit subsequent line-feeding operation of the platen independently of said crank or driver. Provision is also made for rendering the initial stroke of the platen shorter than the return stroke thereof, to secure automatically the line-space between entries on the record sheet; certain mechanism for this purpose being disclosed in said patent. Cer- I tain features herein illustrated are disclosed in pendin United States lapplication No. 478,675. lrovision is also made for limiting the stroke of the crank to less than an entire revolution at will, so as to accommodate bills having short headings thereon.

In the accompanying drawings,Figure 1 is a perspective end View of the platen frame and laten of the well known Underwood frontstrike writing machine with the present improvements applied thereto; the platen driving crank be ng shown as having en- "tered upon its second revolutlo'n from initial stop rack fixed to the a perspective view of one vice seen at Fig.

position. Fig. 2 is a part sectional plan of the platen, devices of said machine; the parts normal positions. Fig. 3 is a sectional plan of'the platcn-controlling devices seen at Fig. 1; th parts shown in normal positions. Fig. is a perspective view of a latch form ing pa :1' of the mechanism for securing automatically a space between cut ries on the record ;-i t. Fig. 5 is a 'icrspective view of the platen-driving pawl or dog. Fig. 6 is a porspcctive view of the pl.-i.tendriving ratchet wheel. Fig. 7 is a perspective view of a loose ii'itcrponent placed between-the platendriving crank and the crank-arresting stop,

to cause the arrest of the crank by the stop.

view of a circula platen frame and car 'rying the pivoted latch seen at Fig. t and the pivoted stop-arm seen at Fig. 11. Fig. 9 is end of the platen carried thereon. it) is a fragmentary view of a rack de- 1, but with the pivoted members omitted. Fig. 11 is a perspective View of a pivoted stop arm for arresting the platen-driving crank on its return to initial position. Fig. 12 is anend elevation showing the parts approximately in normal posi- Fig. 8 is a perspective shaft and certain devices tions and illustrating by a dotted arrow the l t l overlies trip or latcll frame, the ends of the axle projecting through platen frame and line-spacing l the ends of the platen frame end and having shown In linger wheels 4 thereon, by means of which the platen maybe rotated lorwardly or backwardly to an unlimited extent. The platen. is also provided with the usual toothed linespace wheel 5, which is engaged by a yielding detent (i to hold the platen steady when writing. The line-space wheel is advanced intermittently by means of a pawl 7 and a lever 8.

Upon the end of the platen axle 2 lixed a hub 9 ofa wheel 10 having teeth 1 correspending in number to the teeth of the linespace wheel 5. The hub has a flattened portion 9* to fit a corresponding opening 11 in the wheel; the hub also having a dowel 9 to litan opening 11 in the wheel, Figs. 6 and 9. The wheel It) is rotated by means of a )awl or dog 12'pivoted at 13 upon a crank 14l1aving a linger piece 15. 'lhe 100th 16 of the pawl is normally disenga ed i 0111 the wired 10, at Fig. 20, to pern'iit in .lependent rotation of said wheel an Ll aten. A pin 17 projecting from the pawl 12 normally occupes a segmental recess 18 in an annular rim 19, the latter provided upon a disk 20, which is connected by a tie-rod 21 to the platen. frame end The pin 17 normally 22 lornied upon the extent of movement of the platen-driving side of a small disk 22;}, having a pivot or crank from initial position. Fig. 3 shows the platen-driving crank arrested after making the stroke indicated by the arrow at Fig. 12. Fig. llis ah elevation to indicate. the movement oi" a projection on the platendriving pawl to e. ago an interponcn't, and thereby enable the l. tter to arrest the platen; said projection being shown in cross-section. Fig. 15 is a diagram to illustrate the niannc in which the plat ,-n-driving pawl is caused to move into engagement with the platendriving .notchod wheel. Fig. 16 shows the devices at Fig. but omitting the crank. Fig. l? is an elevation illustrating of the pawl projection from the annular guide which. holds the pawl in engagement" with the platci1- .lrivi1ig wheel. Fig. 18 is an elevation showing the operation by the pawl pro cc-tmn of the stop arm, which, at

the coinj'ilction of the return stroke of the .Fig. 15' the crank is arrested by one stop, and

at Fig. 21 by a dili'erent'slop, the latter being in ineffective L'iOSitlOH. at the Fig. 13 operation.

The usual platen 1 of an Underwood typewrit-ing inaciiine is rotatably mounted by means of an axle 2 in the ends 3 of the platen the escape l i i l i stein 24, wln. .rcby it is i hounted in a circular recess .25 formed in the; lived disk 20. The small disk 23 has a pin 20 to engage a slot 27 in the lixed disk 20, (Figs. land 10) to limit the oscillating movements of the small disk and hence oi; the latch or trip thereon. A spring 28 is coiled about the stem 24 (Fig. 3

pinzt'i torcturn thetrip-disk to normal position. The threaded stem 24 has a nut 2t), in the l'orn'i of a (a to inclose the pin 26 and spring 28 and to hold the latch or trip mechanism in place.

When the crank 14 swung forwardly, the pin 17 rides down the lorward inclined edge 3!) of the recess 18, and presses down upon the trip 22, causing the trip-disk to osrillate, liig. t5; and the tooth to of the pawl is caused to engage a tooth 1]. ol' the wheel 10, the pawl moving from the Fig. 20 to the Fig. 15 position. .The pawl is held in. engagement with the toothed'wheel by means of the pin 17, which rides along the inner side of the annularrim 1%). As soon as the pin 17 leaves the recess 18, the trip is returned to'normal position (-l igs. 1, and 2]) by means of the. spring 28. The continued forward; movement of the crank 14 swings the wheel 10 and platen 1 around until the crank isiarrested by an adjustable stop which will be presently described. The crank is then swung b'ackwardly. together with the wheeliO and the platen; but the backward, wheel and platen is prolonged heyond'the forward end of the recess 18, by reason of the movement; of the fol lit]

pin; 17 riding along the under side of the trip 22, which forms a'continuation of the annular riin 19.

A spring 34 coiled about the pawl pivot 13 tends. constantly to swing the pawl outwardly from the wheel and when, during the return motion of the crank, the pin or projection 17 on the pawl arrives opposite the said surface 0 the gap between latch 22 and the opposite end of the recess 18, said spring 34 snaps'the pawlup from the wheel, the 1911117 entering the recess 18, as at Figs. 3 and 17. The return stroke of the crank, Fig. 17, is limited by the engagement of said pin 17 with the stop-arni 36. 1t will be seen. that one surface of the latch 22 formsa continuation of the annular guide 19, and it will be understood that during the return stroke of the platen awl 12 is maintained in engagement with the platen wheel 10 for an additional time, while the rejection 17 is running along i the latch 22, so that this stroke of the laten is longer than the initial stroke thereof, to secure a blank space between entries on the record sheet.

' A succession of notches 37 is formed in the outer edge of the annular guide 19 to form a circular rack for an adjustable pin stop 38. This stop, however, does not project into the )ath of the crank 14 or pawl. 12 so that dur-; ing the first revolution of the crank from the, initial position at Fig. 12, the crank and pawl pass freely by the stop 38. Upon the second revolution of the crank at one stroke in the same direction, an interponont. 39 comes into play said interponent in the form of an arm hung loosely upon I the. hub 9 and lying against the face of the annular guide 19,

between said guide aiidtho wheel 10, and in position to engage the sto) 38. The pro jccting pin 17 'on the pawl 12 extends far enough to engage said intcrponent. Thus by the intervention of the latter the arrest of the crank 14 is eilected. It will bounderstood that during the return stroke 01' the crank, thepin 17 will engage the intcrponent 39 upon the opposite edge 01' the latter, and

then swing the same idly around the hub l) said interponent performing no function upon said return stroke. The stop 38 pro- JCtS irom an arm 40, which has a hub 4-1,

loosely engaging the inainhub l); said hub being retained by acollar 42 secured on the serves to draw the stop.

hub by a screw 43, Fig. 3. The stop pin I 38 projects from a stem 14 carrying at its "outer end a button 45, and at its inner end a nut tfi which fits the inner surface of the-tubular arm 40. By means of the finger-piece 4 5 the stem 44 and stop 38 may be drawn upwardly, for convenience in adjusting the stopro a different notch 37 in the rack; and a spring 17, compressed between the nut46 and a partition 18 inl the tubular arm 10, down into the is-nornially in notch. Said was the paw the first revolution, the pin 17' engages the other side of the stop-arm 36 and-swings it about its pivot 49 to the position at Fig. 1, where it is not only ineffective to arrest the crank, but also serves as a switch or bridge path of said-pin 17 projecting from the 12; but when the crank is completing to close the gap between the latch 22 and the end of the recess 18 in the annular-guide 19,

so that the projection 17 is prevented at this time from rentering said recess 18, and instead of doing so rides along toward the left upon the latch 22 (Fig. 14) and upon, the inner guiding surface of the guide 1.9, until the crank is arrested by means of the interponent 30, as already explained. Thus the pawl is automatically maintained in engagement with. the platen-driving wheel 10 during more than an entire revolution of said wheel in one direction.

During the return of the crank from the position at Fig. 13, the pin 17 projecting longer than the initial stroke thereof, as already explained.

It will be seen that the stop 38 arrests the driver only after the latter has turned through more than an entire revolution -at one stroke iroin the initial position at Figs.

3 and 12; said driver passing the stop 38 once, but being arrested at a succeeding revolution by means of the interponent 39; that the stop 36 is moved by the returning driver into position to arrest said driver alter the latterhas turned through more than an entire revolution from the position at Fig. 13';.that by a single stroke the driver is both connected to the platen, as at Fig. 12, and. turned through more than an entire revolution; and upon return to initial position is automatically disconnected from the laten by the spring't i; and that the stopcarrying armAO is upon one side and the wheel 10 upon the other side of the rack or notches 37.' It will also be seen that the part 14, since it cooperates with the stop 38 to arrest the platen, may be regarded as a stopaneinber cohnectible at will to the platen for rotation therewith, to co-act with the stop-niembers 38 and 36 to limit the rotation of the platen in forward and back.-

ward directions; and that the wheel 10 may be regarded as a clutch-member, and the pawl 12 with the crank 14. as a cooperating driver therefor, -a

&

clutch member, whose engagement is 1116- chanically maintained while the platen rotates more than an entire revolution in each direction, and mechanically broken upon the return of .the member 14 to initial position.

The parts 36, 50 may be regarded as a tripping device, to relieve the projection :17 from the control of he guide 19 at the return of the crank, said tripping-device comprising a pivoted switch 36, which temporarily forms part of the guide 19, and has a cam or arm 50 movable by the crank 14 to throw the switch.

When it is desired to use the machine for bills having short printed headings, the interp'onent 39 is thrown down to the idle-position at Fig. 20 or 21, and the finger-piece 45 is pulled out-to withdraw the stop 38, and is then turned'abou-t its own axis to move said stop 38 to ail-ineffective position, and to bring into play another stop 53, which is of greater length than 38, and su'liiciently long to stand in the path of a shoulder 54 formed on the pawl 12 to arrest the latter and hence the crank and platen, as at Fig. 21, before the crank turns through an entire revolution from initial position, as at Fig. 20. Thus the device may be used for either long or short bill heads, as required. Either stop 38' or 53 may be set into the notches 37.

Variations may be resorted to within the scope of the invention, and portions .of the improvements may be used without others.

,lllavingthus described my invention, I claim;

' 'f ll. Ina typewriting machine, the combination with a revolubleplaten, of a driver thferefor, said driver mounted to turn around the axis of the platen, and a device operative to arrest the driver only after the latter has turned through inorethan an entire revolution at one stroke from initial position.

2. In a typewrit'ing machine, the combination with a revoluble platen, of a revoluble driver therefor, a stop past which said driver .may move, and means to enable said driver,

after passing the stop once, to be arrested thereby at the succeeding revolution of the driver 111 the same direction.

3 In a typewriting machine, the comhimrtion with a revoluhle platen, of a revoluhle driver therefor, a stop out oi the path ofsaid driver, and a loose interponr-nt to engage said 1 uponhe second revolution thereof in the lll'lt. di- 5 rection at one stroke.

itop and said driver to arrest the latter 4. In a typewriting machine, the coml-inm tion with a revoluhle platen, of a revoluble stop out of the path of said driver, and a loose interponent to engage said stop and said driver to arrest the latter upon the second revolution thereof in the same direction at one stroke, said llltfillMJllCl'liklJC- ing freely-movable by said driver during the return stroke of the latter to initial position.

5. In a typewritmg' maclnne, the combinal tion with a revoluble platen, of a revoluble l driver for the platen, and a device nmvable by said driver into position to arrest the driver after the latter has turned through more than an entire revolution from mn'mal position. 1 6. In a typewriting machine, the combinm tion with a revoluble platen, of a revoluble driver for the platen, a device movable by I said driver into position to arrest the driver after the latter has turned through more than an entire revolution from normal position, and a device movable by said driver. during the return stroke thereof, into position for arresting the driver upon return thereol' to initial position.

i 7. In a typmvriting machine, the combination adth a platen and a stop, of a driver nor-- mally disconnected from the platen and capable of turning about the platen axis to an extent deter-inini-vl. by said stop and in excess of 360, and means for enabling a single stroke ol. the driver both to connect it to the platen and toel'ieet rotation of the latter through more than an entire revolution until arrested by said stop.

8. In a typewriting machine, the combine- 1 tion with a revoluble platen, of a notched wheel connected thereto, a driver having a pawl pr dog to engage the .llOiX'llUrfl wheel, a

stop out of the pathoi' said crank, and a loose interponent to engage the stop and ell'eet the arrest of the crank to limit its throw 9. In a typewriting machine, the eombinm tion with a revoluble platen, ol-a notched wlieel-cc'nmected thereto, a driver having a pawl or dog normally disengaged from the notched wheel, means to move the pawl into engagement with said wheel. to enable the crank to turn the wheel and platen, a stop out 01' the path of said crank, and a loose interponent to engage the stop and limit the throw or the crank from normal position.

10. In a typcwriting machine, the rornbi nation with a platen, a platen. li'mnmnnrl an axle for the platen, of a curved racklixed in the platen frame, said axle passing through said rack, a stop adjustable along said rar an arm upon one side olsaid rack and earl i ing said stop and movable about the platen axle, toothed or notched n'hecl upon the other/side of said rack and fixed to the platen axle, a driver having a pawl to engage said toothed wheel, said stop out oi the path of I said driver, and an inierponent hung loosely 1 upon the platen axle betweensaid wheel and i said rack, to engznge saidstop and arrest said driver.

11. in a typewriting marliino, the eombination with a platen, a platen frame, and an axle l'orthe platen, of a curved. rack ii ed to the/platen frame, said axle I said rack, a stop adjustable along said rack, i an arm upon one side of said rack and carry l ing said stop and movable about the platen passing throilgh.

axle, a toothed or notched wheel upon the other side of said rack and fixed to the platen axle, a driver having a pawl toengage said toothed wheel, said stop out of the path of I said driver, and an interponent hung loosely.

upon the platen axle between said wheel and said'rack, to engage said stop and arrest said driver, said driver in the form of a crank, and said wheel mounted between the crank and the rack.

12. In a typewriting machine, the combi nation with a revoluble platen and a revoluble driver therefor, of a stop a d'ustable about the axis of revolution of the river and out 1 5 'ol' the path of the driver, and an intergpnent le by in the path of the driver and arresta said step, said interponent loosely revoluble about the axis of the driver.

13. In a typewriting machine, the combi 2o nation with a platen, of a member normally disconnected from the platen and capable of a mechanically limited turning movement about the platen axis through more than 360 at each stroke and eonnectible to the platen at will for mechanically limiting the extent of rotation of the latter.

14. In a typewriting machine, the combination with a platen, and a platen frame, of a stop device upon the platen frame, and a device connectible at will to the platen to retate therewith and constructed to cooperate with said stop device for mechanically limit-- ing the rotation of the platen only after the latter has turned through more than an en-.

tire revolution at one stroke; a part being included which is adjustable concentrically with the platen to vary the extent of the platen movement.

15. In a typewriting machine, the combination with arevoluble platen, of a crank normally disconnected from. the platen and mounted. to turn about the platen axis, a toothed wheel fixed to the platen, means upon said crank to engage said wheel, means 5 to maintain such engagement during more than an entire revolution of the crank and whrcl: the wheel being normally l isconnected lroi'n the crank, and an adjustable stop for limiting the movement of the crank aitenthe Zr latter has turned more than an entire revolution from initial position.

16. in a typewriting machine, the 'com bination with a revoluble platen, of a pawl and ratchet therefor, a driver to operate the :3 platen by means of. the pawl and ratchet,

and a stop e'l'lective to limitthe stroke of the driver on y after the latter has turned at one stroke through more than an entire revolution from initial position.

bination with a revoluble platen, of a pawl and ratchet. therefor, a driver to operate the platen by means of the pawl and ratchet,

and a stop elleotive to limit the stroke-of the .7. In a typewritmg machine, the com driver only after the latter has turned at one stroke through more than an entire revolution from initial position, means being' provided to maintain the connection between the driver and the platen during the return stroke of the driver to initial position.

18. In a typewriting machine, the combination with a platen, of a wheel connected thereto and provided with teeth or notches,

a crank mounted to turn concentrically with said wheel, a awl controlled by said crank, means norma 1y holding said pawl out of engagement with said wheel, means to enable the crank to move the pawl into engagement-with the wheel, and means to maintain such an engagement. during a stroke of the crank through more than an entire revolution.

19. In a typewriting machine, the combination with a platen, of a wheel connected thereto and provided with teeth or notches, a crank mounted to turn concentrically with said wheel, a awl controlled by said crank,

means normaly holding said pawl out of" engagement with said wheel, means to enable the crank to move the pawl into engagement with the-wheel, means to maintain such an engagement during a stroke of the crank through more than an entire revolution'back to initial position, and means to limit the first stroke of the crank.

20. In a typewriting machine, the combination with a platen, of a wheel connected thereto and provided with teeth or notches, a crank mounted to turn concentrically with said wheel, a pawl controlled by said crank, means normally holding said pawl out of engagement with said wheel, means to enable the crank to move th'epawlinto engagement with the wheel, means to maintain such an engagement during a stroke of the crank through more thanan entire revolution back to imtlal position, and means return movement thereof through more than an entire revolution to initial osition.

22. In a typewriting machine, t 0 combination with a platen, of a driver rotatable forwardly and backwardly about the'platen axis, and relatively adjustable stops for limiting the forward and backward movements or said driver only after the latter has turned through more than a complete revolution at one stroke in either direction; the

" movable freely past both of .an entire revolution, and

platen being normally capable of forward or backward rotation to an unlimited extent independently of said driver. I In a typewriting machine, the combination with a revoluble platen, of a platen driver mounted to turn about the platen axis, and means, including a stop which is adjustable about the platen axis, for arrest- 24. In a typewriting machine, the combi-" nation with. a revoluble platen, of a driver therefor, a stop for arresting the driver upon its return. stroke, means to enable said driver upon its initial stroke to move past said stop, and a device operative to arrest the driver after more than an entire revolution thereof at one stroke from initial position, said driver said stops during its return stroke to initial position.

" 25. In a typewriting machine, the combination with a revol-uble platen, of a driver therefor, a stop for arresting the-driver upon its return stroke, means to enable said driver upon its initial stroke to move past said stop, a device operative to arrest the driver after more than an entire revolution thereof at one stroke from initial position, said driver movable freely past both of said stops during its return stroke to initial connec' the driver automatically with the platen at the beginning of its initial stroke,

and means for automatically disconnecting the driver from the platen return stop as set forth.

26. In a typewriting machine, the combination with a revoluble platen, of a revoluble driver normally disconnected from the platen, means to connect the driver to the platen, a device operative toarrest the driver after the latter has turned through. more than an entire revolution, and a device operative to arrest the driver upon return movement thereof through more than an entire revolution to initial position. f

27. In a typewriting machine, the combination with a revoluble platen, of a revoluble driver normally disconnected from the platen, means to connect the driver to the platen, a device operative to arrest the driver after the latter has turned through more than a device operative to arrest the driver upon return movement thereof through more than an entire revolution to initial osition, said driver mounted to turn about t c axis of the laten 28. In a typewriting mac nation with a revoluble platen and a notched .ine, the combi-f position, means to upon reaching the Wheel connected thereto, of a revi'iluble driver having a pool to engage the notched Wheel and enable the driver to rotate the platen more than an entire revolution at om stroke, a stop to arrest the driver upon its return stroke, and means to enable the driverplaten more than an entire revolution at one i stroke, a stop to arrest the driver upon its return stroke, and means to enable the driver to move said stop out ol its path during the initial stroke of the driver and for restoring the stopto normal position during the return stroke of the driver, means being provided to detain said stop in each of its normal and abnormal positions.

30. Ina typewritinp machine, the combination with a revoluble platen and a notched wheel connected thereto, a revoluble driver having a pawl to engage the notched wheel and enable the driver lo rotate the platen morethan an entire revolution at one stroke, a step out of the path of said crank, a loose interponent to engage the st p and eil'cct the arrest of the crank to limit its throw to normal position, a stop to arrest the driver upon its return stroke, and means to enable the driver to move said return stop out of its path during the initial stroke of thedriver and for restoring the stop to normal position during the return stroke of the driver.

31. In a tjvpexvriting machine, the combination with a revi'iluble platen and a notched wheel connected thereto, a rcvoluble driver having a awl to toga-go the notchedwherd and enab e the driver to rotate the. platen more-than an entire revolution 9. stop out of the path of said crank, it loose interponent to ongngc'the stop and efi'hct the arrest of the crank to limit'its throw to norupon mal position, a stop to arrest the driver its return stroke, and means to enable the driver to move said return step out of its path during the initial. stroke of the driver and for restoring the stop to normal position during the return stroke of the driver, means being provided to detain the last-mentionedstop in each of its normal and abnormal positions.

32. In a typewritin machine, the combi nation with a revolublh'platen' and a platen frame, oftwo clutching members, one where- 'of is connected to the platen-and the other with a fiirgenpieee for whereof is provided rotating the platen, stops effective to limit forward and backward rotation of the at one stroke,

' nation with a revoluble platen and a platen frame, of a toothed wheel connected to the platen, a crank having a toothed member which is normally out of engagement with said wheel, means to move the toothed memher into. engagement with the wheel, said toothed member having aprojection, and a complete annular or circular bearing concen tridwith said wheel and engageable by said pro ection for maintaining the engagement of said toothed member, withsaid wheel dur .ing their rotation at one stroke through more than an entire revolution; a tri )ping device being provided to relieve saii projection from the control of said guide at the return of the crank or'driver through more than hn entire revolution to initial position.

3 1. In a typewritin machine, the combination with a revolub e platen and a platen frame, of a toothed wheel 00 nected to the platen, a crank having a t othed member which is normally out of engagement with said whecl, me ans to move the toothed memher into engagement with the wheel, said toothed member having a projection, and a complete annular or circular bearing concentric with said wheel and engageablc by said projection for maintaining the engagement of said toothed member with said wheel dur ing their rotation at one stroke through more than an entire revolution; a tri )ping device being provided to relieve sair projection from the control of said guide at the return of the crank or driver through more than an entire revolution to initial position, said tripping device comprising a pivoted switch forming part of said uide and having an arm movable by the cran to throw the switch.

35., In a typewritin machine, the combination with a revolubIe platen and a platen frame, of a toothed wheel connected'to the platen, a crank having a toothed member.

whichis normally out of engagcment'with saidwheel, means to move the toothed mem-' her into engagement with the wheel, said toothed member having a projection, and a complete annular or circular bearing concene trio with said wheel and engageable by said projection .for maintaining the engagement of said toothed member with said wheel dur ing their rotation at one strokethrough more than an entire revolution; a tripping device being provided to relievetsai thereof to initial position,

,projection from theleoltrol of said guide'at the return of the crank or'driver through more than an. entire revolution to initial position, said tripping device comprising a pivoted switch formin part of said guide and having an arm movabIelby the crank to throw the switch,

said switch movable by said arm to a position to arrest the crank upon the return thereof to-initial position.

36; In a typewriting machine, the-combination with a revoluble platen and a platen tram of a toothed Wheel connected to the plat n, a crank having a toothed member which isfnormally out of engagement with said wheel, means to move the toothed memher into engagement with the wheel, said toothed member having a projection, a com plete annular or circular bearing concentric with said wheel and engageable by said projection l' r maintaining the engagement of said toothed member with said wheel during their rotation at one stroke through more than anentire revolution; a tri ping device i being provided to relieve sait projection from the control of said guide at the return;

of the crank or driver through more than an entire revolution to initial position, said tripping device comprising a pivoted switch forming part of said guide and having an arm movable by the crank to throw the switch,

said switch movable by said arm to a posi- 4 tion to arrest the crank upon the return thereof to initial position, and a spring to move said projection through a go. in said guide formed by the opening of sai switch,

37. In a typewriting machine, the combination with a rcvoluble platen and a platen frame, of a toothed wheel connected to the platen, a crank having a toothed member which is normally out of engagement wit said wheel, means to move the toothed mem her into engagement with the wheel, said to'othedmember having a projection, a com-- plete annular or circular bearing concentric with said wheel and engageable by said projectionifor maintaining the engagement of said toothed member with said wheel during their rotation at one stroke through more than an entire revolution; a tripping device being provided to relieve said projection from the control of said guideat the return of the crank or driver through more than an entire revolution to initial position, said triping device comprising a pivoted switch iorming part of said guide and having an arm movable by the crank to throw the switch, said switch movable by said arm to a position to arrest the crank upon the return and a spring to move said projection through a gap in said guide formed by the openingaof said switch,

said gap or recess having a to cooperate with said projection to enable the crank to force the pawl into engagement eveled portion nation witha revoluble platen, of a notched.

wheel connected thereto, a driving pawl having a pin. normally occupying a recess in an annular guide, a pivoted latch partly closing said recess and forming a part of the annular guide, a crank on which the pawl is pivoted, said. crank mounted concentrically with said notched whechand said recess having a cam portion to cooperate with saidipin to enable the crank to throw the pawl into engagement with saidwheel, a switch movable by said pin to close said recess at the completion of a revolution of the crank from normal position, to guide the pin to run past said recess and permit the crank to enter upon a second revolution of the notched wheel in the same direction, a stop out of the path of said crank,

a loose interponent to engage the stop and effect the arrest of the crank at the completion of-the throw thereof from normal posi-- tion, and an arm upo'ns'aid switch to enable said pin to open the switch during the return stroke of the crank; said open switch serving as a stop to engage the pin and liause the arof the pawl and crank and to direct the pin into said recess at the completion of the stroke of the crank to initial position,

89. The combinationawith a platen, of a crank normally disconnected therefrom, and means to lock the crank to the platen during the rotation of the crank more than an entire revolution from initial position and back to initial position. i

40. The combination with a platen, of a crank normally disconnected therefrom, and means to lock the crank to the platen during the rotation of the crank more than an entire revolution from initial position andback to initial positio'n and, then to discoiinect the crank from the platen.

41. The combinationwith a platen, of acrank normally disconnected therefrom, and

means to lock the crank to'the platen during the rotation of the crank more than an entire revolution from initial position and back to initial position-and then to disconnect the crank from the platen, means being provided for rendering the initial stroke of the platen of different length from the'return stroke thereof.

42. In a typewriting machine, the combination. with a revoluble platen, of a pawl and ratchet therefor, a driver to operate the platen by means of the pawl and ratchet, a stopeffe'ctive to limit the stroke of the driver only after the latter has turned at one stroke througl' -more than an entire revolution from initial. position, means being provided to maintain the connection between the driver and the platen during the return stroke of the driver to initial position; andmeans besaid wheel, a pawl controlled by said crank,

means normally holding said pawl out of engagement with said wheel, means to enable the crank to move the pawl into engagement with the wheel, means to maintain such an engagement during a stroke of the crank through more than an entire revolution, and back to initial position, and means to hunt the first stroke of the crank; means being provided to disconnect the crank from the platen after the return stroke of the platen has exceeded in length the initial stroke thereof.

44. In a typewriting machine, the combistroke thereof through more than an entire revolution to initial position; provisionbeing' made to cause the return stroke of the platen to exceed in length the initial stroke thereof.

45. In a typewriting machine, the combination with a revoluble platen, of a driver therefor, a stop for arresting; the driver, said stop mounted to be movable by the driver out of the'path of the latter as it enters upon its second revolution in "a single stroke, and means for enabling said driver in its return stroke upon passing said stop to set the same into effective position.

46. In a typewriting machine, the combination with a revoluble platen, of a driver therefor, a stop for-arresting the driver, said stop mounted to be movable by the driver out of the path of the latter as it enters upon its second revolution in a single stroke, and means for enabling said driver in its return stroke upon passing said stop to set the same into effective position, said stop having a pivot upon which it swings into and out of effective position and. also having an arm, and said driver having a projection for moving said stop out of its path, for swinging said stop by means of said arm, and for engagement with the stop to arrest the returning driver.

47. In a typewriting machine, the combination with a revoluble platen, of a driver therefor, a stop for arresting the driver, said step mounted to be 'lnovable by the driver out of the path of the latter as it entersupon the driver automatically from the platen upon being arrested by said stop.

48. In a typewriting machine, the combination with a revoluble platen and a wheel connected thereto, 01' a revoluble driver hav ing a pawl to engage the wheel, means .to disconncct the pawl from the wheel automatically upon the return of the driver to initial position, and means to enable the driver to render sald disconnectlng means ineffective,

so as to permitvthe driver to turn through more than an entire revolution at one stroke without becoming disconnected "from the platen; means being provided to enable the driver upon its return stroke to render said disconnecting means effective,

49. In a'typewriting machine, the combination with a revoluble platen and a wheel connected thereto, of a revoluble driver havmg a pawl to engage the wheel, said pawl having a projection, an annular guide for said projection, said guide having a recess, a spring to cause the projection to enter the recess and the pawl tobecome disconnected from, the wheel, and means to enable the driver to close said recess, so as to permit the driver to turn through more than an entire revolution at one stroke without becoming disconnected from the platen, provision being made to enable the driver during its return stroke to open said recess.

' 50. In a typewriting machine, the combination with a revoluble platen and a wheel connected thereto, of a revoluble driver having a pawl to engage the wheel, said pawl 40 having a projection, an annular guide for said projection, said guide having a' recess, a spring to cause the projection to enter the recess and the pawl to become disconnected from the wheel, and means to enable the driver to close said recess, so as to permit the driver to turn through more than an entire revolution at one stroke without becoming disconnected from the platen; provision being made to enable the driver during its return stroke to open said recess, said recessclosing means including a pivoted arm in the oath of a projection on the pawl and movable y said projection to close said recess; said arm being provided with a cam tobe engaged by saidprojection during the return stroke of the driver to swing said closing-arm to open said recess.

51. In a typewriting machine, the combination with a revoluble platen and a wheel connected thereto, of a revoluble driver having a pawl to engage the wheel, said pawl having a projection, an annular guide for said projection, said gu de having a recess, a spring to cause the pro ection to enter the 5 recess and the pawl to become disconnected from the wheel, and means to enable the driver to close said recess, so as to permit the driver to turn through more than an entire revolution at one stroke without becoming disconnected from the platen; provision being made to enable theil'river during its re- 7 turn stroke to open said recess, said recessclosing means including a pivoted arm in the path of a pro ectlon on the pawl and movable by said pro ection to close said recess; said arm being provided with a can-1 to be engaged by said projection during the return stroke of the driver to swing said closing-arm to open said recess, said closing-arm also serving as a stop to arrest said driver upon its final return to initial position.

52. In a typewriting machine, the combination with a revoluble platen, of a revoluble driver therefor, and an adjustable stop mechanism for limiting the stroke, of the driver to either less or more than an entire revolution at will., 53. In a typewriting machine, thecombination with a revoluble platen, of a driver therefor, said drivermounted to turn around arrest the driver only after the latter has turned through more than an entire revolution at one stroke from initial osition, and a stop for limiting the stroke 0 the driver. to less than an entire revolution, at will.

54. In a typewriting machine, the combination with a revoluble platen, of a revoluble driver therefor, a stop past which said driver may move, means to enable said driver, after passing the stop once, to be arrested thereby at the succeeding revolution of the driver in the same direction, and a stop for limiting the stroke of the driver to less than an entire revolution, at will.

55. The combination with a revoluble platen, of a stop adjustable about the laten axis, means to enable the platen to e arrested by said stop after the platen has turned during one stroke more than an entire revolution, a second stop also adjustable about the platen axis, for limiting the stroke of the platen to less than an entire revolution, and means for silencing the second sto 56. The combination with a revo uble platen, of a stop adjustable about the laten.

said stops in the form of pins connected to render either effective and the other inefleot we.

57. The combination with a revoluble platen, of a stop adjustable about the laten axis, means to enable the platen to e arrested by said stop after the platen has turned during one stroke more than an entire revolution, a second stop also adjustable about the platen axis, for limiting the stroke of the platen to less than an entire revolution,

a rack into which either of said pins may be set.

58. The combination with a revoluble platen, of a stop adjustable about the platen axis, means to enable the platen to be arrested by said stop alter the platen has turned during one stroke more than an en tire revolution, a second step also adjustable about the platen axis, for limiting the stroke of the platen to less than an entire revolution, means for silencing the second stop; said stops in the form of pins connected to render either eli'ective and the other ineffective, and a rack into which either of said pins may be set; both pins yieldingly carried upon an arm which is hung to turn about the platen axis.

59. In a typewriting machine, the combination with a platen revoluble l'or line-spacing, 01' a plurality ol' stops lor arresting the revolution of the platen', and a rack along which said stops are adjustable together;

said stops mounted and connected to permit either to be set into ell'ective position and cause the other to be rendered inell'ective.

60. In a typewriting machine, the combination with a revolublc platen, of a revoluble driver therefor, a stop out of the path of said driver, a loose interponent to engage said stop and said driver to arrest the latter upon the second revolution thereof in the same direction at one stroke, and a second step movable into the path ol the driver at will ;to limit its stroke to less than an entire revolution.

6]. In a typewriting machine, the eombination- With a revoluble platen and a revolu ble driver therefor, of a stop adjustable about the axis of revolution of the driver and out of the path of the driver, an interponent in the path of the driver and arrostable by said step, said interponent loosely reveluble about the axis of the driver, and a second step also adjustable about the axis of revolution of the driver and movable into the path of the driver at will to limit its stroke to less than an entire revolution.

62. In a typewriling machine, the combination with a platen, of a wheel connected thereto and provided with teeth or notches, a crank mounted to turn concentrically with said wheel, a pawl controlled by said crank, means normally holding said pawl out of engagement with. said wheel, means to enable the crank to move the pawl into engagement with the wheel, means to maintain such'an engagement during a stroke 01' the crank through more than an entire revolution back to initial position, and means to limit the lirst stroke of the crank to either more or less than an entire revolution, at will.

J FRANK ALlJAltD.

Witnesses:

Jnnnnmn J. Munrni', Jonn 0. Snirnirr. 

